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Day 1 Chapter 19.1

Day 1 Chapter 19.1. Lecture 19A Properties of Acids & Bases. Taste sour or tart When strong - good electrolytes (conduct electricity) Causes indicators to change color, example : phenolphthalein (turns clear), bromothymol blue (turns yellow). Turns litmus paper red

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Day 1 Chapter 19.1

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  1. Day 1 Chapter 19.1 Lecture 19A PropertiesofAcids & Bases

  2. Taste sour or tart When strong - good electrolytes (conduct electricity) Causes indicators to change color, example: phenolphthalein (turns clear), bromothymol blue (turns yellow). Turns litmus paper red Release H2 gas when they react with metals Taste bitter and feel slippery Electrolytes Cause indicators to change color, ex: phenolphthalein, (turns pink) and bromothymol blue (turns gray-blue). Turns litmus paper blue Acids and bases dissolve in water to form solutions that: Properties of Acids & Bases Acids Bases

  3. Soda contains:Carbonic acid, H2CO3 & phosphoric acid H3PO4 Vinegar, HC2H3O2 Milk & Fruit What do these chemical formulas for acids have in common? Ammonia Antacid Milk of magnesia-Mg(OH)2 lye-NaOH What do the last two chemical formulas for bases have in common? Products Containing Acids & Bases BASES ACIDS Formula for Arrhenius acids: HA “A” can be various anions nonmetals/polyatomics Formula for Arrhenius bases: MOH “M” can be differentmetals

  4. Name & Formulas for Acids & Bases Write the formula for the following acid and bases: Hydrobromic acid - HBr Strontium hydroxide - Sr(OH)2 Sulfurous acid - H2SO3 Name the following acid and bases: HNO3- Nitric acid Rememorize the rules for naming acids & bases!

  5. Day 1 Chapter 19.1 Lecture 19A Arrhenius Acid-Base Theory

  6. H H – + O O Cl Cl H H H H Definition of Arrhenius Acids When dissolved in waterArrhenius acids produce H3O+ (hydronium ions). HCl + H2O  H3O+ + Cl- acid water Hydronium Ion

  7. Types of Acids Acids that contain one ionizable hydrogen. Acids that contain two ionizable hydrogens. Acids that contain three ionizable hydrogens. HNO3 H2SO4 H3PO4

  8. Definition of Arrhenius Bases When dissolved in waterArrhenius bases produce OH- (hydroxide ions). H2O 2 Ca2+(aq) + OH-(aq) Ca(OH)2 (s) Alkali metals react with water to produceArrhenius bases and hydrogen gas. 2Na(s)+ 2H2O 2NaOH(aq) + H2(g) Na+(aq) + OH-(aq)

  9.  The final solution no longer has acid or base properties! Neutralization Reaction acid +base salt + water When Arrhenius acid and base solutions are mixed, salt and water are produced! HCl + Ca(OH)2 CaCl2 + HOH An indicator is used to show the presence of the base or acid.

  10. Day 1 Chapter 19.1 WS 19A Now for a little homework…

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